Filters
Question type
Study Flashcards

Naphthalene combustion may be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is -40.1 kJ/g. When 0.8210 g of naphthalene was burned in a bomb calorimeter containing 1.000 kg of water, a temperature rise of 4.21°C was observed. What is the heat capacity of the bomb calorimeter excluding the water?


A) 32.9 kJ/°C
B) 7.8 kJ/°C
C) 3.64 kJ/°C
D) 1.76 kJ/°C
E) 15.3 kJ/°C

F) C) and D)
G) A) and C)

Correct Answer

verifed

verified

A(n) ________ ________ is a process where heat is absorbed from the surroundings.

Correct Answer

verifed

verified

Which represents an enthalpy change at 25 °C and 1 atm that is equal to ΔHof for H2O(l) ?


A) O2(g) + 2H2(g) → 2H2O(l)
B) ½O2(g) + H (g) → H2O(g)
C) H2(g) + ½O2(g) → H2O(l)
D) 2H2O(l) → O2(g) + 2H2(g)
E) H2O(l) → ½O2(g) + H2(g)

F) A) and E)
G) A) and B)

Correct Answer

verifed

verified

What is q if 28.6 g of water is heated from 22.0°C to 78.3°C? The specific heat of water is 4.184 J/g·°C.


A) 2.60 J
B) 2.63 kJ
C) 6.74 kJ
D) 9.37 kJ
E) 3.94×104 kJ

F) B) and E)
G) C) and D)

Correct Answer

verifed

verified

Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E) Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like?


A) Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E)
B) Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E)
C) Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E)
D) Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E)
E) Suppose a 0.500-g sample of an organic compound is analyzed via bomb calorimetry. The temperature of the calorimeter is measured over time. At t = 5 min, the combustion reaction is initiated. Below is a plot of the data that are obtained. Suppose the experiment is repeated under identical conditions, but with a 1.000-g sample of the organic compound. What might a plot of the resulting data look like? A) B) C) D) E)

F) C) and D)
G) A) and B)

Correct Answer

verifed

verified

Internal energy = ________ + ________

Correct Answer

verifed

verified

If 75.4 J of energy is absorbed by 0.25 mol of CCl4 at constant pressure, what is the change in temperature? The specific heat of CCl4 is 0.861 J/g·°C.


A) 17.8°C
B) 21.9°C
C) 2.3°C
D) 9.1°C
E) 44.6°C

F) A) and E)
G) B) and C)

Correct Answer

verifed

verified

A home aquarium is an example of an open system.

A) True
B) False

Correct Answer

verifed

verified

A system delivers 1275 J of heat while the surroundings perform 854 J of work on it. What is ΔU of the system?


A) -2129 J
B) -421 J
C) +421 J
D) +2129 J
E) -1275 J

F) B) and E)
G) All of the above

Correct Answer

verifed

verified

Thunderstorms are powered by the heat released when water vapor changes to rain drops. How much heat is released when a gallon of rain falls? (1 gal = 3,785 g; specific heat of vaporization of water = 2,262 J/g)

Correct Answer

verifed

verified

The sign of w when work is done by the system on the surroundings is ________.

Correct Answer

verifed

verified

When an automobile engine starts, the metal parts immediately begin to absorb heat released during the combustion of gasoline. How much heat will be absorbed by a 165-kg iron engine block when the temperature rises from 15.7°C to 95.7°C? (The specific heat of iron is 0.489 J/g·°C.)

Correct Answer

verifed

verified

The enthalpy change for making one mole of a compound from its elements is called the ________.

Correct Answer

verifed

verified

enthalpy o...

View Answer

Which of these is not a state function?


A) volume
B) temperature
C) pressure
D) heat
E) energy

F) A) and C)
G) A) and B)

Correct Answer

verifed

verified

Which of the following is incorrectly matched?


A) Radiant energy; solar energy able to influence global climate patterns
B) Thermal energy; related to temperature irrespective of the volume
C) Energy; capacity to do work
D) Chemical energy; potential energy

E) None of the above
F) B) and D)

Correct Answer

verifed

verified

What is the change in temperature if a 25.0-g block of aluminum absorbs 10.0 kJ of heat? The specific heat of aluminum is 0.900 J/g·°C.


A) 0.44°C
B) 22.5°C
C) 225°C
D) 360°C
E) 444°C

F) B) and E)
G) C) and E)

Correct Answer

verifed

verified

Based on the following thermochemical equations, what is the heat of vaporization of titanium(IV) chloride? Ti(s) + 2 Cl2(g) → TiCl4(l) ΔH = -804.2 kJ/mol TiCl4(g) → 2 Cl2(g) + Ti(s) ΔH = 763.2 kJ/mol


A) +41.0 kJ/mol
B) -1567.4 kJ/mol
C) 1567 kJ/mol
D) -41.0 kJ/mol
E) -763.7 kJ/mol

F) B) and D)
G) C) and D)

Correct Answer

verifed

verified

Two solutions (the system) , each with a volume of 25.0 mL at 25.0°C, are mixed in a beaker. A reaction occurs between them, and the temperature rises to 35.0°C. After the products have equilibrated with the surroundings, the temperature is again 25.0°C and the total volume is 50.0 mL. No gases are involved in the reaction. Which relationship concerning the change from initial to final states (both at 25.0°C) is correct?


A) ΔU = 0
B) ΔH = 0
C) ΔU > 0
D) q = 0
E) w = 0

F) C) and D)
G) B) and D)

Correct Answer

verifed

verified

A system expands from a volume of 1.00 L to 2.00 L against a constant external pressure of 1.00 atm. What is the work (w) done by the system? (1 L·atm = 101.3 J)


A) 1.00 J
B) 2.00 J
C) 1.01 × 102 J
D) 1.01 × 105 J
E) 3.00 J

F) B) and E)
G) A) and B)

Correct Answer

verifed

verified

At body temperature 2404 joules of energy are required to evaporate 1.00 g of water. After vigorous exercise, a person feels chilly because the body is giving up heat to evaporate the perspiration. A typical person perspires 25 mL of water after 20. minutes of exercise. How much body heat is this person using to evaporate this water?

Correct Answer

verifed

verified

Showing 21 - 40 of 141

Related Exams

Exam 1

Chemistry: the Central Science

133 Questions

Exam 2

Atoms, Molecules, and Ions

124 Questions

Exam 3

Stoichiometry: Ratios of Combination

137 Questions

Exam 4

Reactions in Aqueous Solutions

146 Questions

Exam 6

Quantum Theory and the Electronic Structure of Atoms

135 Questions

Exam 7

Electron Configuration and the Periodic Table

120 Questions

Exam 8

Chemical Bonding I: Basic Concepts

102 Questions

Exam 9

Chemical Bonding II: Molecular Geometry and Bonding Theories

139 Questions

Exam 10

Gases

137 Questions

Exam 11

Intermolecular Forces and the Physical Properties of Liquids and Solids

137 Questions

Exam 12

Modern Materials

108 Questions

Exam 13

Physical Properties of Solutions

151 Questions

Exam 14

Chemical Kinetics

132 Questions

Exam 15

Chemical Equilibrium

146 Questions

Exam 16

Acids and Bases

137 Questions

Exam 17

Acid-Base Equilibria and Solubility Equilibria

133 Questions

Exam 18

Entropy, Free Energy, and Equilibrium

107 Questions

Exam 19

Electrochemistry

122 Questions

Exam 20

Nuclear Chemistry

127 Questions

Exam 21

Environmental Chemistry

135 Questions

Exam 22

Coordination Chemistry

132 Questions

Exam 23

Metallurgy and the Chemistry of Metals

152 Questions

Exam 24

Nonmetallic Elements and Their Compounds

117 Questions

Exam 25

Organic Chemistry

121 Questions

Show Answer